package 事物查询;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

/*转账：A给B转5000元*/
public class Transaction2 {
    public static void main(String[] args) {
        String fkf = null;
        String skf = null;
        int rmb = 0;
        //接收用户输入Scanner50
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入本次的转账金额：");
        rmb = sc.nextInt();
        System.out.println("请输入付款方id:");
        fkf = sc.next();
        System.out.println("请输入收款方id:");
        skf = sc.next();
        System.out.println("正在转账"+rmb+"元");
        String url = "jdbc:mysql://localhost:3306/db_jdbc_demo?characterEncoding=utf8&useSSL=false&serverTimezone=UTC";
        String user = "root";
        String pass = "000000";
        Connection conn = null;
        Statement stmt = null;
        //ResultSet省略，因为Update没有结果集
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(url, user, pass);
            String sql1 = "update t_account set money = money - "+rmb+" where id="+fkf;
            String sql2 = "update t_account set money = money + "+rmb+" where id="+skf;
            //开启事务
            conn.setAutoCommit(false);
            stmt = conn.createStatement();
            int i = stmt.executeUpdate(sql1);
//            int x = 5 / 0;
            int j = stmt.executeUpdate(sql2);
            if (i + j == 2) {
                System.out.println("转账成功!");
                conn.commit();
            } else {
                System.out.println("转账失败!");
            }
        } catch (Exception e) {
//            e.printStackTrace();
            System.out.println("转账出现异常!");
            try {
                conn.rollback();
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
        } finally {
            try {
                stmt.close();
                conn.close();
            }catch (SQLException e){
                e.printStackTrace();
            }
        }
    }
}
